Electric reflector lamp



Sept. 15, 1931. P. RATHMANN ELECTRIC REFLECTOR LAMP Filed May 31, 1930ZZT Patented Sept. 15, 1931 UNITED STATES PATENT OFFICE PAUL RATHMANN, FBOD'ENBACH, CZECHOSLOVAKIA, ASSIGNOR TO FIRM ELEK- TROTECHNISCHE FABRIKSCHMIDT & CO., GESELLSCHAFT M. B. H., 0F BOIDENBACH,

CZECHOSLOVAKIA ELECTRIC REFLECTOBl LAMP Application filed May 31, 1930,Serial No. 458,614, and in Czechoslovakia November 27, 1929.

The present invention relates to electric incandescent lamps fitted withreflectors in which the lamp bulb is adjustable along the axis of thereflector, and its object is to facilitate adjustment of the lamp bulbwithout lateral displacement relatively to the reflector, and also tofacilitate exchange of the lamp bulb and examination of the lampcontacts.

These objects are attained by mounting the lamp socket to slide in thereflector sleeve, and making a known pin and inclined slot connectionbetween the sleeve and a rotatable bush arranged between the reflectorsleeve and the lamp socket, so that by turning a lever attached to thebush, the socket is moved axially in relation to the reflector.

It is preferable to attach the lamp socket rigidly to the battery holderand to make the latter of box form, so that it may be firmly guided inthe lamp casing, and the electrical connection between lamp contact,battery pole and switch contacts may be maintained undisturbednotwithstanding displacement of the lamp relatively to the reflector.The box form of battery holder also provides a convenient place forsockets for spare lamps.

The accompanying drawing shows a construction according to theinvention, where Fig. l is an axial section of a lamp,

Fig. 2 is a view of the interior of its casing with the battery holderremoved and its guide omitted,

Fig. 3 is a View of its battery holder seen from that side where theincandescent lamp and the spare lamps are arranged,

Fig. 4 is a detail of Fig. 2

With reference to the drawing the reflector 10 has a sleeve 11 as usual,in which is an inclined slot 12 ending in a groove 12 parallel to theaxis through which a pin on the bush 13 may be introduced. Alternativelythe slot may be cut in the bush and the pin may be on the reflectorsleeve. The bush 13 fits the reflector sleeve and has attached to it ahand lever 14 projecting laterally out of the lamp casing 15. In the 59'bush 13 fits the smooth cylindrical periphery of the lamp socket body16, so that the bush 13 may be turned relatively to the socket body 16by the hand lever 14. The lamp 17 is screwed into the socket body 16 inthe usual manner. The socket body 16 for the lamp is fastened to a boxform battery holder 18 which is open on the side remote from the lampl'l' to receive the battery 19. A spring 20 secured to the lid 21 of thecasing tends to move the battery 19 and box 18 and the socket body 16towards the reflector.

Mountedon the battery box 18 are two holders 22, 23 for spare lamps asshown in Fig. 3.

The spindle of the switch lever 24 carries a switch contact spring 25 bywhich the lamp may be connected as desired either to battery contacts orto an external supply from a dynamo connected to the terminal 26. Theconnections for this purpose form no part of the present invention andare thereforenot explained in detail. All that matters as regards thepresent subject is that. the battery box 18 establishes connection onthe one hand between the contacts of the switch and both a battery poleand a lamp contact, and on the other hand between the otherbattery poleand the, other lamp contact. :To this end the battery box is fitted withinsulatedcontact strips 27, 28 one connectedto the lamp contact 29 andthe other to one. pole of the battery. The electrical connection betweenthe other pole of the battery and the other lamp contact is effected bya. battery'contact strip making metallic connection with the socket body16.

The electrical connection between both the terminal 26 and the conductorleading from the dynamo and the incandescent lamp is eifected partly bythe lamp casing to which a lamp pole is electrically connected throughthe intermediaryof the battery box, and partly by a contact spring 30,which is insulated from the casing and extending to the switch.-

After opening the lid 21 a battery 19 may be put into the battery boxwith its short terminal strip either to left or right as de sired, andthe lamp is then ready. The lamp may be focused by turning the arm 14the outer end of which is insulated from the lamp casing, and so movingbattery box and the battery in the casing.

The socket body 16 may be made axially movable relatively to the batterybox instead of being rigidly secured thereto, in which case the batterybox does not share the movement of the lamp. p

The hand lever 14 may be wholly within the lamp casing.

In order that the incandescent lamp may readily be brought into or outof the focus of the reflector as desired, a bolt 35 having a head 36 anda nut 37 (Figs. 2 and 4) is mo'vably set in the slot in the casingthrough which the hand lever 14 passes. On loosening the nut 37 the bolt35 may be moved into any desired position and secured there bytightening the nut. In this way the position of the hand lever 14 whichbrings the filament of the lamp into exact focus of the reflector may beestablished once for all, so that there is no need to find it by trialand error on each occasion of use.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is Claims: I

1. An electric reflector lamp, comprising a reflector having a sleeve, acasing for the said reflector, a slot in said casing, an incandesciblelamp adjustable along the said axis of the reflector, and means foradjusting the incandescible lamp along the said axis of the reflector,the said means comprising a bush mounted between the lamp socket and thereflector sleeve, a pin and inclined slot connection between thereflector sleeve and the said bush, the latter being immovable axiallybut rotatable with respect to the lamp socket, a hand lever secured tothe bush and adapted upon actuation to move the lamp socket axially inrelation to the said sleeve the said hand lever projecting exteriorly ofthe casing, an ad ustable abutment slidably mounted in the slot of thecasing through which the hand lever passes, the abutment defining thatposition of the hand lever in which the lamp filament is in the focus ofthe reflector, and means tending to urge the lamp socket forwardly ofthe reflector, the said bush tending to resist said last mentionedmeans.

2. An electric reflector lamp comprising a reflector having a sleeve, acasing for the said reflector, a slot in said casing, an incandesciblelamp adjustable along the axis of the reflector, and means for adjustingthe said lamp along the said axis of the reflector, the said meanscomprising a lamp socket slidably mounted in the reflector sleeve, 'abush mounted between the lamp socket and the reflector sleeve, a pininclined slot connection between the reflector sleeve and the said bush,the latter being immovable axially but rotatable with respect to thelamp socket, a hand lever secured to the bush and adapted upon actuationto move the lamp socket axially relative to the reflector sleeve, thesaid hand lever projecting 'exteriorly of the casing, and an adjustableabutment slidably mounted in the slot in the casing through which thehand lever passes, and comprising a headed bolt and a nut, the saidabutment defining that position of the hand lever in which the lampfilament is in the focus of the reflector, and a spring tending to movethe lamp socket forwardly of the said reflector, the bush resisting thistendency.

In testimony whereof I aflix my signaturef 1 PAUL RATHMANN.

